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Two potent inflammatory mediators, interleukin 1 (IL-1) and tumor necrosis factor (TNF) as well as lipopolysaccharide (LPS) increased group II phospholipase A2 (PLA2) mRNA levels, which resulted in enhanced secretion of the PLA2 enzyme from rat smooth muscle cells. cAMP-elevating agents also stimulated the release of PLA2 and increased the mRNA, but IL-1, TNF and LPS did not affect cAMP levels. Furthermore, the effects of TNF and cAMP-elevating agents were not additive but synergistic. Therefore, we concluded that the level of rat group II PLA2 mRNA is controlled at least by two distinct mechanisms, one involves cAMP and the other is mediated by TNF, IL-1 and LPS. This study also suggests important roles of group II PLA2 in pathogenesis of vascular inflammation.
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